Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
  • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
  • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
  • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
  • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
  • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
  • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
  • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
  • H04B7/0658—Feedback reduction
  • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
  • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
  • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
  • H04L1/0028—Formatting
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
  • H04L27/2601—Multicarrier modulation systems
  • H04L27/2626—Arrangements specific to the transmitter only
  • H04L27/2627—Modulators
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
  • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/02—Traffic management, e.g. flow control or congestion control
  • H04W28/04—Error control
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
  • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W84/00—Network topologies
  • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
  • H04W84/04—Large scale networks; Deep hierarchical networks
  • H04W84/042—Public Land Mobile systems, e.g. cellular systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/08—Access point devices

Definitions

• the present application relates generally to wireless communications and, more specifically, to a technique for improved interference power estimation.
• Modern communication systems include transceivers that comprise a plurality of antennas arranged in a plurality of configurations.
• information relating to the configuration of the antennas needs to be communicated to the device communicating with the transceiver.
• this communication requires considerable bandwidth and is not easily done.
• the conveyance of the configuration of the antennas represents significant overhead to a communication system. Therefore, there is a need in the art for an improved system and method for conveying antenna configuration information.
• These methods may include obtaining a data for transmission, encoding the data and modulating the data.
• the data may be configured in such a way as to convey the configuration of the data through the modulation of the data.
• These methods may also include obtaining an antenna configuration, obtaining a representation of the antenna configuration, and masking the data with an error correcting code, where the mask corresponds to the antenna configuration.
• a wireless communication network comprising a plurality of base stations capable of wireless communication with a plurality of subscriber stations within a coverage area of the network.
• at least one of the plurality of base stations is capable of encoding a transmission antenna configuration into a QPSK constellation and transmitting the QPSK constellation.
• the transmission may be masked with an error correction code that corresponds to a transmit antenna configuration.
• systems and methods are disclosed with a base station capable of wireless communication with a plurality of subscriber stations within a coverage area of a network.
• the base station is capable of transmitting data with at least one antenna, encoding a configuration of the at least one antenna, encoding a configuration of the at least one antenna
• These methods may further comprise transmitting an error correction code that has been masked to represent the configuration of the transmit antennas.
• FIGURE 1 illustrates an exemplary wireless network that transmits ACK/NACK messages in the uplink according to the principles of the present disclosure
• FIGURE 2 is a high-level diagram of an OFDMA transmitter according to one embodiment of the present disclosure
• FIGURE 3 is a high-level diagram of an OFDMA receiver according to one embodiment of the present disclosure.
• FIGURE 4 is a high-level diagram of a transmission chain according to one embodiment of the present disclosure.
• FIGURE 5 is a diagram of a constellation mapping of QPSK modulation according to one embodiment of the present disclosure.
• FIGURE 6 is a diagram of a modified constellation mapping of QPSK modulation according to one embodiment of the present disclosure
• FIGURE 7 is a diagram of a second modified constellation mapping of QPSK modulation according to one embodiment of the present disclosure.
• FIGURE 8 is a diagram of a third modified constellation mapping of QPSK modulation according to one embodiment of the present disclosure.
• FIGURE 9 is a diagram of a fourth modified constellation mapping of QPSK modulation according to one embodiment of the present disclosure.
• FIGURE 10 is an example of a transport chain illustrating constellation remapping according to one embodiment of the present disclosure
• FIGURE 11 is a flowchart of the interpretation of signals by a subscriber station according to one embodiment of the present disclosure
• FIGURE 12 is a block diagram of the mapping of constellations and CRC masking according to one embodiment of the present disclosure.
• FIGURE 13 is a block diagram of CRC masking according to one embodiment of the present disclosure.
• FIGURE 14 is a flowchart of the interpretation of signals by a subscriber station according to one embodiment of the present disclosure
• FIGURE 15 is a block diagram of the remapping of constellations and CRC mapping according to one embodiment of the present disclosure.
• FIGURE 16 is a flowchart of the interpretation of signals by a subscriber station using both a QPSK constellation and a CRC mask of the present disclosure.
• FIGURES 1 through 16 discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.
• FIGURE 1 illustrates exemplary wireless network 100, which transmits ACK/NACK messages according to the principles of the F200811-0007 present disclosure.
• wireless network 100 includes base station (BS) 101, base station (BS) 102, base station (BS) 103, and other similar base stations (not shown) .
• Base station 101 is in communication with base station 102 and base station 103.
• Base station 101 is also in communication with Internet 130 or a similar IP-based network (not shown) .
• Base station 102 provides wireless broadband access (via base station 101) to Internet 130 to a first plurality of subscriber stations within coverage area 120 of base station 102.
• the first plurality of subscriber stations includes subscriber station 111, which may be located in a small business (SB), subscriber station
• 113 which may be located in a WiFi hotspot (HS) , subscriber station
• HS WiFi hotspot
• 114 which may be located in a first residence (R) , subscriber station
• subscriber station 116 which may be a mobile device (M) , such as a cell phone, a wireless laptop, a wireless PDA, or the like.
• M mobile device
• Base station 103 provides wireless broadband access (via base station 101) to Internet 130 to a second plurality of subscriber stations within coverage area 125 of base station 103.
• the second plurality of subscriber stations includes subscriber station 115 and subscriber station 116.
• 101-103 may communicate with each other and with subscriber stations 111-116 using OFDM or OFDMA techniques.
• Base station 101 may be in communication with either a greater number or a lesser number of base stations. Furthermore, while only six subscriber stations are depicted in FIGURE 1, it is understood that wireless network 100 may provide wireless broadband access to additional subscriber stations. It is noted that subscriber station 115 and subscriber station 116 are located on the edges of both coverage area 120 and coverage area 125. Subscriber station 115 and subscriber station 116 each communicate with both base station 102 and base station 103 and may be said to be operating in handoff mode, as known to those of skill in the art.
• Subscriber stations 111-116 may access voice, data, video, video conferencing, and/or other broadband services via Internet 130.
• one or more of subscriber stations 111-116 may be associated with an access point (AP) of a WiFi WLAN.
• Subscriber station 116 may be any of a number of mobile devices, including a wireless-enabled laptop computer, personal data assistant, notebook, handheld device, or other wireless-enabled device.
• Subscriber stations 114 and 115 may be, for example, a wireless-enabled personal computer (PC) , a laptop computer, a gateway, or another device.
• PC personal computer
• FIGURE 2 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) transmit path.
• FIGURE 3 is a high-level diagram of an orthogonal frequency division multiple access (OFDMA) receive path.
• the OFDMA transmit path is implemented in base station (BS) 102 and the OFDMA receive path is implemented in subscriber station (SS) 116 for the purposes of illustration and explanation only.
• BS base station
• SS subscriber station
• the OFDMA receive path may also be implemented in BS 102 and the OFDMA transmit path may be implemented in SS 116.
• the transmit path in BS 102 comprises channel coding and modulation block 205, serial-to-parallel (S-to-P) block 210, Size N Inverse Fast Fourier Transform (IFFT) block 215, parallel-to-serial (P-to-S) block 220, add cyclic prefix block 225, up-converter (UC) 230.
• the receive path in SS 116 comprises down-converter (DC) 255, remove cyclic prefix block 260, serial-to-parallel (S-to-P) block 265, Size N Fast Fourier Transform (FFT) block 270, parallel-to-serial (P-to-S) block 275, channel decoding and demodulation block 280.
• DC down-converter
• FFT Fast Fourier Transform
• FIGURES 2 and 3 may be implemented in software while other components may be implemented by configurable hardware or a mixture of software and configurable F200811-0007 hardware.
• FFT blocks and the IFFT blocks described in this disclosure document may be implemented as configurable software " algorithms, where the value of Size N may be modified according to the implementation.
• the value of the N variable may be any integer number (i.e., 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable may be any integer number that is a power of two (i.e., 1, 2, 4, 8, 16, etc.) .
• channel coding and modulation block 205 receives a set of information bits, applies coding (e.g., Turbo coding) and modulates (e.g., QPSK, QAM) the input bits to produce a sequence of frequency-domain modulation symbols.
• Serial-to-parallel block 210 converts (i.e., de-multiplexes) the serial modulated symbols F200811-0007 to parallel data to produce N parallel symbol streams where N is the IFFT/FFT size used in BS 102 and SS 116.
• Size N IFFT block 215 then performs an IFFT operation on the N parallel symbol streams to produce time-domain output signals.
• Parallel-to-serial block 220 converts (i.e., multiplexes) the parallel time-domain output symbols from Size N IFFT block 215 to produce a serial time-domain signal.
• Add cyclic prefix block 225 then inserts a cyclic prefix to the time-domain signal .
• up-converter 230 modulates (i.e., up-converts) the output of add cyclic prefix block 225 to RF frequency for transmission via a wireless channel.
• the signal may also be filtered at baseband before conversion to RF frequency.
• the transmitted RF signal arrives at SS 116 after passing through the wireless channel and reverse operations to those at BS 102 are performed.
• Down-converter 255 down-converts the received signal to baseband frequency and remove cyclic prefix block 260 removes the cyclic prefix to produce the serial time-domain baseband signal.
• Serial-to-parallel block 265 converts the time-domain baseband signal to parallel time domain signals.
• Size N FFT block 270 then performs an FFT algorithm to produce N parallel frequency-domain signals.
• Parallel-to-serial block 275 converts the parallel frequency-domain signals to a sequence of modulated data symbols.
• Channel decoding and demodulation block 280 F200811-0007 demodulates and then decodes the modulated symbols to recover the original input data stream.
• Each of base stations 101-103 may implement a transmit path that is analogous to transmitting in the downlink to subscriber stations 111-116 and may implement a receive path that is analogous to receiving in the uplink from subscriber stations 111-116.
• each one of subscriber stations 111-116 may implement a transmit path corresponding to the architecture for transmitting in the uplink to base stations 101-103 and may implement a receive path corresponding to the architecture for receiving in the downlink from base stations 101-103.
• the present disclosure describes methods and systems to convey information relating to base station configuration to subscriber stations and, more specifically, to relaying base station antenna configuration to subscriber stations.
• This information can be conveyed through a plurality of methods, including placing antenna configuration into a quadrature-phase shift keying (QPSK) constellation (e.g., n-quadrature amplitude modulation (QAM) signal, wherein n is 2 A x) and placing antenna configuration into the error correction data (e.g., cyclic redundancy check (CRC) data) .
• QPSK quadrature-phase shift keying
• QAM quadrature-phase shift keying
• QAM quadrature amplitude modulation
• CRC cyclic redundancy check
• QAM is a modulation scheme which conveys data by modulating the amplitude of two carrier waves . These two waves are referred to as quadrature carriers, and are generally out of phase with each other by 90 degrees.
• QAM may be represented by a constellation that comprises 2 ⁇ x points, where x is an integer greater than 1.
• the constellations discussed will be four point constellations (4-QAM) .
• 4-QAM constellation a 2 dimensional graph is represented with one point in each quadrant of the 2 dimensional graph.
• additional information e.g., reference power signal
• N refers to the IFFT/ fast Fourier transform (FFT) size used by the OFDM system.
• FFT fast Fourier transform
• the signal after IFFT is parallel-to-serial converted and a cyclic prefix (CP) is added to the signal sequence.
• CP cyclic prefix
• the total bandwidth in an OFDM system is divided into narrowband frequency units called subcarriers.
• the number of subcarriers is equal to the FFT/IFFT size N used in the system.
• the number of subcarriers used for data is less than N because some subcarriers at the edge of the frequency spectrum are reserved as guard subcarriers. In general, no information is transmitted on guard subcarriers .
• the coded broadcast channel (BCH) transport block is mapped to 4 OFDM symbols within a subframe.
• three base stations 101-103 antenna configurations will be used as examples herein. These configurations are one transmission antenna, two transmission antennas using a space frequency block coding (SFBC) transmission scheme, and four transmission antennas using SFBC - frequency switching transmission diversity (FSTD) transmission scheme. While different transmissions schemes are used, detecting the number of transmission antennas based upon the schemes is difficult. Each transmission scheme has a large portion of the signal which can be considered as a subset of the other schemes, and therefore it is difficult to reliably detect and determine the scheme being used based upon the signal. Therefore, the antenna configuration will need to be encoded either into the physical broadcast channel (P-BCH) transport block and related QAM constellation or the error correction data of the P-BCH transport block.
• P-BCH physical broadcast channel
• QPSK modulation is used for P-BCH.
• the 4-QAM constellation comprises four separate points that are F200811-0007 distributed into the four quadrants of a two-dimensional mapping.
• the following is a table illustrating the constellation mapping that will be discussed in the present disclosure:
• a transmission chain is a series of operations preformed to prepare data for transmission. These operations may include scrambling, modulating, and mapping data. Transmission chains may be used consistent with a plurality of communication techniques, including orthogonal frequency division multiplexing (OFDM) .
• OFDM orthogonal frequency division multiplexing
• FIGURE 4 mapped data across a predetermined time interval is illustrated by FIGURE 4. It is understood that the examples disclosed relating to the encoding of data disclosed herein range from 10ms-40ms, but that any time interval may be used consistent with the disclosed systems and methods.
• FIGURE 4 is an example of a method that may be used consistent with this disclosure to encode data.
• FIGURE 4 is a high level description of the transmission of a BCH transport block.
• the P-BCH is received by the mapping mechanism in a BCH transport block (Block 301) .
• Channel coding which includes rate matching is applied to the BCH transport block (Block 302) .
• the data may be modified to embed error correcting information into the data from the BCH transport block that can be used to convey antenna configuration.
• the encoded and rate matched data is scrambled (Block 303) and modulated (Block 304) .
• the resulting modulated data is mapped onto the QSPK data stream into frames (Block 305) .
• the map will be altered to convey antenna configuration information. It is understood that this transmit chain is provided for exemplary purposes only, and that other transmit chains, in various orders with various steps, may be used consistent with the present disclosure.
• F200811-0007 F200811-0007
• FIGURE 5 is a two-dimensional constellation mapping of QPSK modulation using the data shown in Table 1.
• Table 1 As was discussed above in each frame encoded by the transmit chain, there are four items that are mapped onto the QSPK data stream. For example purposes, these four information elements will be referred to as 00 (in quadrant A), 01 (in quadrant B), 10 (in quadrant C), and 11 (in quadrant D) .
• the QPSK constellation mapping can provide information relating to the configuration of the antennas within the base stations 101-103. In general, since there are 4 constellation points in a QPSK modulation, there are a total of 4 ! (24) total possible mappings as shown in below. The following is a table of all of the available mappings:
• FIGURE 5 is an example of mapping index #14 shown in Table
• A, B, C, and D are quadrants of the QPSK constellation.
• the mapping of elements 00, 01, 10, and 11 into quadrants A, B, C, and D can be detected by the subscriber station.
• the antenna configuration of the base stations 101-103 transmitting the constellation illustrated by FIGURE 5 can be determined.
• the antenna configuration can be determined through the QPSK mapping and is independent of the transmission scheme and the number of antennas used. Therefore, the use of a constellation mapping coupled with a known QPSK table, such as the one illustrated by Table 3, offers a reliable method for determining the antenna configuration of the base stations 101-103.
• FIGURE 5 is one example of a QPSK mapping
• FIGURE 6, 7, 8, and 9 are examples of various other mappings.
• FIGURE 6 is an example of mapping #1 in Table 2, and is substantially similar to FIGURE 5 with the addition of illustrating the position of each mapping relative to 1/W2.
• FIGURES 7, 8, and 9 are examples of mappings that are preformed upon FIGURE 6. The purpose of these mappings is to add antenna configuration data to the QPSK mapping of data. This addition of data may be preformed through mapping, shifting, or negation as illustrated by FIGURES 7, 8, and 9. It is explicitly understood that any method of adjusting the QPSK constellation may be used.
• F200811-0007
• FIGURE 7 is a 90 degree phase shift of the data in FIGURE 6.
• the antenna configuration relating to mapping index #11 of Table 3 can be conveyed.
• the configuration of 4 SFBC/FSTD is determined.
• FIGURE 8 is an example of a negation mapping.
• FIGURE 8 is a negation on the I-part after mapping index #1. Through the negation, the antenna configuration relating to mapping index #17 of Table 3 can be conveyed. Through this mapping, the configuration of 3 SFBC/FSTD is determined.
• FIGURE 9 is another example of a negation mapping.
• FIGURE 8 is a negation on the Q-part after mapping index #1. Through the negation, the antenna configuration relating to mapping index #8 of Table 3 can be conveyed. Through this mapping, the configuration of 3 SFBC/FSTD is determined.
• FIGURE 10 is an example of a transport chain 600 illustrating constellation remapping.
• a channel rate coding including rate matching is preformed (Block 601) .
• the channel rate signal is scrambled (Block 602) .
• the scrambled signal is modulated (Block 603) .
• constellation remapping is performed (Block 604) .
• the remapping of the constellation is done so that the resulting mapping will convey the antenna configuration of the F200811-0007 base stations 101-103.
• the constellation remapping is performed by first identifying the base stations 101-103 antenna configuration. After the antenna configuration is determined, a mapping that corresponds to the antenna configuration is selected. Using the selected mapping configuration, QPSK remapping is preformed to convey the antenna configuration. Finally, data framing is preformed where data is placed onto frames for transmission (Block 605) .
• mapping index #1 in Table 3 is used.
• the output of the constellation remapping step ⁇ (0),..., ⁇ (M symb -1) can be described as a mapping in Table 3 whose index is a function /(N,), where N, is the number of transmission antennas in the base stations
• the modulation step and constellation remapping step are defined by 3 (out of 24) possible mappings in Table 3.
• the following function shows the mapping that corresponds to the number of antennas in a given configuration: F200811-0007
• mapping index #14 of Table 3 can be viewed by applying a 90 degree shift at the output of the modulation step.
• d(0),...,d(M symb - ⁇ ) , d ⁇ i)-d j ⁇ i)+jd o (i) for i 0,... M symb -1, and are real and imaginary parts of d(i) .
• the output of the constellation remapping step gives a symbol sequence described by:
• a -90 degree shift can be applied at the output of the modulation step on top of mapping #1.
• This -90 degree phase shift also translates into an I-Q switch with a negation operation.
• mapping index #17 of Table 3 can be viewed by applying a negation operation on the I-part at the output of the modulation step.
• mapping index #8 of Table 3 can be viewed by applying a negation operation on the F200811-0007
• a mathematical function may be applied to determine the antenna configuration removing the need for Table 3.
• a mod function may be applied to an index that results in the configuration of the antenna.
• FIGURE 11 is a flowchart 700 of the interpretation of signals by a subscriber station received from base stations 101-103.
• Block 701 The subscriber station then collects a sequence of symbols over the allocated PBCH resource (Block 702) . At this point,
• Blocks 706, 711, and 715 four separate decodes are preformed. These decodes are preformed at the timings 10, 20, 30, and 40 ms . Therefore, while the configuration of the antennas in the base stations 101-103 can be determined, the timing may not be determined. The time is confirmed by testing the decodes at each timing against the CRC check. When the result of the CRC check is true, the timing and antenna configuration is confirmed.
• the number of transmit antennas is known (Block 708) . This information along with the correct timing is used to interpret the PBCH content. It is understood that the constellation remapping as a function of number F200811-0007 of transmit antennas can be applied to other physical channel, and to other modulations such as BPSK, 16QAM and 64QAM, etc.
• a CRC masking step is added to the PBCH transport block.
• the resulting transmission chain 800 is shown in FIGURE 12.
• the CRC masking means the CRC bits are masked by a bit sequence that is a function of the number of transmit antennas .
• FIGURE 12 shows that data is input into the system (Block 801) .
• a CRC mask is applied to the data entering into the system (Block 802) .
• the data is then scrambled (Block 803) and modulated (Block 804) . Premapping, as discussed in the previous embodiment, may optionally be added. (Block 805) .
• the data is placed onto data frames (Block 806) .
• FIGURE 13 is an example 900 of how the CRC mask may be applied.
• a P-BCH payload is received for transmission (Block 901) .
• a CRC code is generated (Block 902) .
• This CRC code is then masked by a sequence that is a function of the number of transmit antennas (Block 903) .
• a CRC check is usually performed on data to ensure the reliability and integrity of the data.
• a CRC may be polynomial of x ⁇ 4+x+l. This can be used to check to F200811-0007 see that the data is intact. This polynomial can be applied to any data consistent with the CRC-4 Standard. Take for instance the following input data:
• the present disclosure uses a plurality of masks to alter data. These masks are then checked against the CRC check to determine which is true. For instance, using the data 000000001, the following masks could be used:
• the masked data when received by the subscriber station, goes through an inverse process of demasking. If the masked data is demasked by the "right" mask, then the CRC check will be true. For instance, 00000003 demasked with the one antenna mask would not equal 00000001, and therefore the CRC check would fail. The 00000003 demasked with the two antenna mask would equal 00000001, and therefore the CRC check would succeed. In this way, the data transmitted to a subscriber station can be masked with information relating to the antenna configuration of the base stations 101-103.
• the P-BCH is concatenated with the masked CRC (Block 904) .
• the data is combined with the masked CRC allowing the data to be appropriately interpreted by the subscriber station.
• FIGURE 14 is a flowchart 1000 of the interpretation of signals by a subscriber station received from base stations 101-103.
• a signal is received by the subscriber station (Block 1001).
• the subscriber station collects a sequence of symbols over the allocated PBCH resource (Block 1002) .
• three assumptions are made as to the antenna configuration. One of the three should result in a true result, and the true result will correspond to the correct antenna configuration.
• the CRC embodiment does not give information directly relating to the antenna configuration. Therefore, unlike the QSPK constellation embodiment, each assumption may be tried.
• Blocks 1005, 1011, and 1015 four separate decodes are performed. These decodes are performed at the timings 10, 20, 30, and 40 ms . Therefore, while there are three assumptions being made about the number of antennas in the base stations 101-103, each one of these configurations may have four timings. Therefore, there are actually twelve tests performed to determine the correct configuration of base stations 101-103.
• FIGURE 15 is an example embodiment 1100 where both QPSK constellation mapping and CRC masking are used. Data is input into the system (Block 1101) .
• a CRC mask is applied to the data entering into the system (Block 1102) .
• the data is then scrambled (Block 1103) and modulated (Block F200811-0007
• the antenna configuration is then mapped onto the QPSK constellation, and the data is placed onto data frames (Block 1105) .
• FIGURE 16 is a flowchart 1200 of the interpretation of signals by a subscriber station received from base stations 101-103 using both a QPSK constellation and a CRC mask.
• a signal is received by the subscriber station (Block 1201) .
• the subscriber station then collects a sequence of symbols over the allocated PBCH resource (Block 1202). This information is used to determine the antenna configuration of the base stations 101-103 through the QPSK constellation. Three assumptions can be used to confirm the antenna configuration obtained from the QPSK constellation .
• the output from the remapping step is then demodulated assuming two transmitters using an SFBC receiver (Block 1209) .
• descrambling and decoding are performed on the data (Block 1210) .
• a CRC check is performed on the decoded data using a second CRC mask (Block 1211) . If the CRC check passes, then the assumption that there are two transmit antennas is confirmed.
• Blocks 1205, 1210, and 1214 four separate decodes are performed. These decodes are performed at the timings 10, 20, 30, and 40 ms . Therefore, while there are three assumptions being made about the number of antennas in the base stations 101-103, each one of these configurations may have four timings. Therefore, there are actually twelve tests performed to determine the correct configuration of base stations 101-103. F200811-0007

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